# Program support utilities

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< cpp‎ | utility

### Program termination

The following functions manage program termination and resource cleanup.

Defined in header `<cstdlib>`
abort | causes abnormal program termination (without cleaning up) (function)
exit | causes normal program termination with cleaning up (function)
quick_exit (C++11) | causes quick program termination without completely cleaning up (function)
_Exit (C++11) | causes normal program termination without cleaning up (function)
atexit | registers a function to be called on std::exit() invocation (function)
at_quick_exit (C++11) | registers a function to be called on std::quick_exit invocation (function)
EXIT_SUCCESSEXIT_FAILURE | indicates program execution status (macro constant)

### Unreachable control flow
Defined in header `<utility>`
unreachable (C++23) | marks unreachable point of execution (function)
| (since C++23)

### Communicating with the environment

Defined in header `<cstdlib>`
system | calls the host environment's command processor (function)
getenv | access to the list of environment variables (function)

### Signals

Several functions and macro constants for signal management are provided.

Defined in header `<csignal>`
signal | sets a signal handler for particular signal (function)
raise | runs the signal handler for particular signal (function)
sig_atomic_t | the integer type that can be accessed as an atomic entity from an asynchronous signal handler (typedef)
SIG_DFLSIG_IGN | defines signal handling strategies (macro constant)
SIG_ERR | return value of `signal` specifying that an error was encountered (macro constant)
##### Signal types
SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM | defines signal types (macro constant)

### Non-local jumps

Defined in header `<csetjmp>`
setjmp | saves the context (function macro)
longjmp | jumps to specified location (function)
##### Types
jmp_buf | execution context type (typedef)

### See also

C documentation for Program support utilities

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